Add announce address detection to internal/mail/router.go following
the same pattern as isListAddress/parseListName and isQueueAddress/
parseQueueName.
Added:
- isAnnounceAddress(address string) bool - returns true for 'announce:' prefix
- parseAnnounceName(address string) string - extracts channel name
- ErrUnknownAnnounce error variable
(gt-pn2fq)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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